Met Éireann has forecast that temperatures could rise to as high as 31C after the Irish record for the month of May was broken three times in two days.
Over 160 Irish peacekeepers were welcomed home by family and friends at Dublin Airport, following a six-month deployment with the UN Interim Force in Lebanon.
Rescuers were "racing against time" to extract seven people trapped in a flooded cave for a week in Laos, a specialist diver involved in the operation said.